LAB409
Collect
24-hour or random urine. Refrigerate 24-hour specimen during collection.
Patient Preparation
If possible, abstain from medications for 72 hours prior to collection.
Specimen Preparation
Thoroughly mix entire collection (24-hour or Random) in one container. Transfer a 4 mL aliquot to an ARUP Standard Transport Tube. (Min: 2.5 mL) A pH lower than 2 can cause assay interference. Record total volume and collection time interval on transport tube and test request form.
Specimen preservation can be extended to 1 month refrigerated by performing one of the following:
Option 1: Transfer a 4 mL aliquot to an ARUP Standard Transport Tube. (Min: 2.5 mL) Adjust pH to 2.0-4.0 with 6M HCl.
Option 2: Transfer a 4 mL aliquot to an ARUP Standard Transport Tube containing 20 mg sulfamic acid (ARUP Supply #48098), available online through eSupply using ARUP Connect™or contact ARUP Client Services at (800) 522-2787. (Min: 2.5 mL)
Specimen preservation can be extended to 1 month refrigerated by performing one of the following:
Option 1: Transfer a 4 mL aliquot to an ARUP Standard Transport Tube. (Min: 2.5 mL) Adjust pH to 2.0-4.0 with 6M HCl.
Option 2: Transfer a 4 mL aliquot to an ARUP Standard Transport Tube containing 20 mg sulfamic acid (ARUP Supply #48098), available online through eSupply using ARUP Connect™or contact ARUP Client Services at (800) 522-2787. (Min: 2.5 mL)
Unacceptable Conditions
Specimens preserved with boric acid or acetic acid.
Storage/Transport Temperature
Refrigerated. Also acceptable: Frozen.
Stability (from collection to initiation)
Ambient: Unacceptable; Refrigerated: 2 weeks (unpreserved), 1 month (preserved); Frozen: 1 month
Laboratories.Performed
Sun-Sat
Methodology
Quantitative High Performance Liquid Chromatography-Tandem Mass Spectrometry
Reported
1-4 days
Synonyms
- LAB409
- METAFU
Ordering Recommendations
First-line test in suspected pheochromocytoma.
Reference Interval
| Reference Intervals for 24 Hour Calculations (24-Hour Urine) | |||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Components | Reference Interval | ||||||||||||||||||||||||||||
| Metanephrine, Urine - per 24h |
| ||||||||||||||||||||||||||||
| Normetanephrine, Urine - per 24h |
| ||||||||||||||||||||||||||||
| Creatinine, 24-Hour Urine |
| ||||||||||||||||||||||||||||
| Reference Intervals for Ratio-to-Creatinine (CRT) Calculations (Random Urine) | ||
|---|---|---|
| Components | Reference Interval | |
| Age | Metanephrine | |
| Metanephrine | 0-3 months 4-6 months 7-11 months 1 year 2-5 years 6-17 years 18 years and older | 0-700 µg/g crt 0-650 µg/g crt 0-650 µg/g crt 0-530 µg/g crt 0-500 µg/g crt 0-320 µg/g crt 0-300 µg/g crt |
| Age | Normetanephrine | |
| Normetanephrine | 0-3 months 4-6 months 7-11 months 1 year 2-5 years 6-17 years 18 years and older | 0-3400 µg/g crt 0-2200 µg/g crt 0-1100 µg/g crt 0-1300 µg/g crt 0-610 µg/g crt 0-450 µg/g crt 0-400 µg/g crt |
Interpretive Data
The optimal specimen for this testing is a 24-hour urine collection. Per-day calculations are not reported for patients younger than 7 years of age and for the following specimen types: a random collection, a collection with duration of less than 20 hours, a collection with duration of greater than 28 hours, or a collection with total volume less than 400 mL (if 18 years of age or older) or greater than 5000 mL (all ages). Ratios to creatinine may be useful for these evaluations.
Smaller increases in metanephrine and/or normetanephrine concentrations (less than two times the upper reference limit) usually are the result of physiological stimuli, drugs, or improper specimen collection. Essential hypertension is often associated with slight elevations (metanephrine less than 400 µg/d and normetanephrine less than 900 µg/d). Elevated concentrations may be due to intense physical activity, life-threatening illness, and drug interferences.
Significant elevation of one or both metanephrines (three or more times the upper reference limit) is associated with an increased probability of a neuroendocrine tumor.
Smaller increases in metanephrine and/or normetanephrine concentrations (less than two times the upper reference limit) usually are the result of physiological stimuli, drugs, or improper specimen collection. Essential hypertension is often associated with slight elevations (metanephrine less than 400 µg/d and normetanephrine less than 900 µg/d). Elevated concentrations may be due to intense physical activity, life-threatening illness, and drug interferences.
Significant elevation of one or both metanephrines (three or more times the upper reference limit) is associated with an increased probability of a neuroendocrine tumor.
CPT Codes
83835
| Collection |
LAB409
Collect
24-hour or random urine. Refrigerate 24-hour specimen during collection.
Patient Preparation
If possible, abstain from medications for 72 hours prior to collection.
Specimen Preparation
Thoroughly mix entire collection (24-hour or Random) in one container. Transfer a 4 mL aliquot to an ARUP Standard Transport Tube. (Min: 2.5 mL) A pH lower than 2 can cause assay interference. Record total volume and collection time interval on transport tube and test request form.
Specimen preservation can be extended to 1 month refrigerated by performing one of the following:
Option 1: Transfer a 4 mL aliquot to an ARUP Standard Transport Tube. (Min: 2.5 mL) Adjust pH to 2.0-4.0 with 6M HCl.
Option 2: Transfer a 4 mL aliquot to an ARUP Standard Transport Tube containing 20 mg sulfamic acid (ARUP Supply #48098), available online through eSupply using ARUP Connect™or contact ARUP Client Services at (800) 522-2787. (Min: 2.5 mL)
Specimen preservation can be extended to 1 month refrigerated by performing one of the following:
Option 1: Transfer a 4 mL aliquot to an ARUP Standard Transport Tube. (Min: 2.5 mL) Adjust pH to 2.0-4.0 with 6M HCl.
Option 2: Transfer a 4 mL aliquot to an ARUP Standard Transport Tube containing 20 mg sulfamic acid (ARUP Supply #48098), available online through eSupply using ARUP Connect™or contact ARUP Client Services at (800) 522-2787. (Min: 2.5 mL)
Unacceptable Conditions
Specimens preserved with boric acid or acetic acid.
Storage/Transport Temperature
Refrigerated. Also acceptable: Frozen.
Stability (from collection to initiation)
Ambient: Unacceptable; Refrigerated: 2 weeks (unpreserved), 1 month (preserved); Frozen: 1 month
| Ordering |
Performed
Sun-Sat
Methodology
Quantitative High Performance Liquid Chromatography-Tandem Mass Spectrometry
Reported
1-4 days
Synonyms
- LAB409
- METAFU
Ordering Recommendations
First-line test in suspected pheochromocytoma.
| Result Interpretation |
Reference Interval
| Reference Intervals for 24 Hour Calculations (24-Hour Urine) | |||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Components | Reference Interval | ||||||||||||||||||||||||||||
| Metanephrine, Urine - per 24h |
| ||||||||||||||||||||||||||||
| Normetanephrine, Urine - per 24h |
| ||||||||||||||||||||||||||||
| Creatinine, 24-Hour Urine |
| ||||||||||||||||||||||||||||
| Reference Intervals for Ratio-to-Creatinine (CRT) Calculations (Random Urine) | ||
|---|---|---|
| Components | Reference Interval | |
| Age | Metanephrine | |
| Metanephrine | 0-3 months 4-6 months 7-11 months 1 year 2-5 years 6-17 years 18 years and older | 0-700 µg/g crt 0-650 µg/g crt 0-650 µg/g crt 0-530 µg/g crt 0-500 µg/g crt 0-320 µg/g crt 0-300 µg/g crt |
| Age | Normetanephrine | |
| Normetanephrine | 0-3 months 4-6 months 7-11 months 1 year 2-5 years 6-17 years 18 years and older | 0-3400 µg/g crt 0-2200 µg/g crt 0-1100 µg/g crt 0-1300 µg/g crt 0-610 µg/g crt 0-450 µg/g crt 0-400 µg/g crt |
Interpretive Data
The optimal specimen for this testing is a 24-hour urine collection. Per-day calculations are not reported for patients younger than 7 years of age and for the following specimen types: a random collection, a collection with duration of less than 20 hours, a collection with duration of greater than 28 hours, or a collection with total volume less than 400 mL (if 18 years of age or older) or greater than 5000 mL (all ages). Ratios to creatinine may be useful for these evaluations.
Smaller increases in metanephrine and/or normetanephrine concentrations (less than two times the upper reference limit) usually are the result of physiological stimuli, drugs, or improper specimen collection. Essential hypertension is often associated with slight elevations (metanephrine less than 400 µg/d and normetanephrine less than 900 µg/d). Elevated concentrations may be due to intense physical activity, life-threatening illness, and drug interferences.
Significant elevation of one or both metanephrines (three or more times the upper reference limit) is associated with an increased probability of a neuroendocrine tumor.
Smaller increases in metanephrine and/or normetanephrine concentrations (less than two times the upper reference limit) usually are the result of physiological stimuli, drugs, or improper specimen collection. Essential hypertension is often associated with slight elevations (metanephrine less than 400 µg/d and normetanephrine less than 900 µg/d). Elevated concentrations may be due to intense physical activity, life-threatening illness, and drug interferences.
Significant elevation of one or both metanephrines (three or more times the upper reference limit) is associated with an increased probability of a neuroendocrine tumor.
| Administrative |
CPT Codes
83835
